package com.sky.service.impl;

import com.sky.constant.MessageConstant;
import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.exception.ShoppingCartBusinessException;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

/**
 * @Auther: Tangguo
 * @Date: 2023-04-29  23:24
 * @description: 添加购物车
 */
@Service
public class ShoppingCartServiceImpl implements ShoppingCartService {

    @Autowired
    private ShoppingCartMapper shoppingCartMapper;
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private SetmealMapper setmealMapper;

    /**
     * @param shoppingCartDTO:
     * @return void
     * @description 添加购物车
     */
    public void addShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        //1.新建购物车对象
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);

        //2. 添加用户id到购物车对象(只能查询自己的购物车数据)
        shoppingCart.setUserId(BaseContext.getCurrentId());
        //3.判断当前商品是否在购物车中
        List<ShoppingCart> shoppingCartList=shoppingCartMapper.list(shoppingCart);

        if(shoppingCartList!=null&&shoppingCartList.size()>0){
            //如果已经存在，就更新数量，数量加1
             shoppingCart= shoppingCartList.get(0);
             shoppingCart.setNumber(shoppingCart.getNumber()+1);
             shoppingCartMapper.updateNumberById(shoppingCart);
        }else {
            //如果不存在，插入数据，数量就是1
            //判断当前添加到购物车的是菜品还是套餐
            Long dishId = shoppingCartDTO.getDishId();
            if(dishId!=null){
                //添加到购物车的是菜品
                Dish dish = dishMapper.getById(dishId);
                shoppingCart.setName(dish.getName());
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setAmount(dish.getPrice());
            }else {
                //添加到购物车的是套餐
                Setmeal setmeal = setmealMapper.getById(shoppingCartDTO.getSetmealId());
                shoppingCart.setName(setmeal.getName());
                shoppingCart.setImage(setmeal.getImage());
                shoppingCart.setAmount(setmeal.getPrice());
            }

            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartMapper.insert(shoppingCart);

        }

    }

    /**
     * @param :
     * @return List<ShoppingCart>
     * @description 查看购物车
     */
    public List<ShoppingCart> showShoppingCart() {
        return shoppingCartMapper.list(ShoppingCart.builder().userId(BaseContext.getCurrentId()).build());
    }

    /**
     * @param :
     * @return void
     * @description 清空购物车商品
     */
    public void cleanShoppingCart() {
        shoppingCartMapper.deleteByUserId(BaseContext.getCurrentId());
    }

   /**
    * @param shoppingCartDTO:
    * @return void
    * @description 减少购物车一个商品的数量
    */
    public void subtract(ShoppingCartDTO shoppingCartDTO) {
        //1.新建购物车对象
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);

        //2. 添加用户id到购物车对象(只能查询自己的购物车数据)
        shoppingCart.setUserId(BaseContext.getCurrentId());
        //3.判断当前购物车中是否有商品
        List<ShoppingCart> shoppingCartList=shoppingCartMapper.list(shoppingCart);

        if(shoppingCartList!=null&&shoppingCartList.size()>0) {
            //如果已经存在，就更新数量
            shoppingCart = shoppingCartList.get(0);
            if(shoppingCart.getNumber()>1){
                //数量大于1，就数量减1
                shoppingCart.setNumber(shoppingCart.getNumber()-1);
                shoppingCartMapper.updateNumberById(shoppingCart);
            }else if(shoppingCart.getNumber()==1){
                //数量等于1时，就删除商品
                shoppingCartMapper.delete(shoppingCart);
            }else {
                throw new ShoppingCartBusinessException(MessageConstant.SHOPPING_CART_Deduction_Errors);
            }
        }

    }
}
